Introduction: Based on conflicting results and concerns related to plyometric exercise- induced muscle soreness, the present study will conducted to compare the effect of a single-session plyometric and strength weight training on some biochemical, inflammatory and performance indices of delay onset muscle soreness (DOMS) in male Taekwondo athletes.
Methods: In a quasi-experimental design, twenty Taekwondo athletes (aged 25-28 years, BMI 18-22 Kg/m2 and at least 3 years sport history) in two random homogeneous groups will participate in an exhaustive single-session strength weight training (6 sets leg press and Knee extension with 70% one repetition maximum) or plyometric training (6 sets deep and side jump with 70% Maximum high jump). Biochemical (Serum creatine kinase: CK), inflammatory (Peripheral blood leukocyte count; Serum C-reactive protein: CRP; interleukin-6: IL-6; Thigh circumference and perceived soreness) and performance indicators (Flexibility, maximal isometric strength and explosive power lower limb) will determine in both groups during the four stages (10 days, 30 min before and immediately and 24 hours after the exercise session). Serum CK, CRP and IL-6 will measure by photometric, immunoturbidometric and ELISA assays (with commercial Pars-Azmoon and Bendermed kits), respectively. The peripheral blood leukocytes counts will determine by automatic analyzer. Muscle circumstance and perceived soreness will determine by flexible tap and Talag Scale, respectively. Flexibility, maximal isometric strength and explosive power of lower limb will determine by wells, dynamometric and sargent vertical jump tests, respectively. Data will be expressed as mean (±SD) and analyzed by repeated measure ANOVA, Bonferroni and independent samples t tests at P≤0.05.